My Undercover seems to be rattling (for lack of a better word) around 60mph and up. I've tried everything thing I can think of including removing my drop in bed liner. What do you guys suggest?

 

I've often noticed a rattle too at high speeds. It isn't often, but it isn't rare either. After about 5 times of it happening, I noticed one thing in common: high winds. This is purely conjecture, but I attribute the rattle to windy conditions rather than high speeds.

 

I had this happen also, I found in a call to Undercover that the front flap is a little long and it hits the cab when flapping in the wind. I was instructed to trim 1/4inch off that flap, I didn't think that was it but I trim it anyway and the noise is GONE.

 

Amazing, thanks torqmonstr! I wouldn't have thought that was it either.

 

Trimmed 1/4 inch off flap. No more noise. Thank you Sir!